Home / server / Questions / 157582
In Process
kamal
Asked: 2010-07-06 05:48:07 +0800 CST

using perl how can i automte login to remote linux host using ssh

  • 772

currently, i have statements like : system("ssh -o StrictHostKeyChecking=no root\@${address} \"cat /var/log/messages""); This did not require a password, since the two systems were setup with proper key exchange

now this is no longer available: hence:

i want to be able to :

  1. Login as "admin"
  2. Supply a password
  3. do a sudo -i
  4. supply a password
  5. run the same command "cat /var/log/messages"

Thanks, -Kamal.

perl ssh

3 Answers

  1. When using Perl, always look for a module in CPAN for the task. Almost certainly someone has already solved your problem. In this case: Net::SSH::Perl.

    • 4

  2. Rather than use sudo, you can probably just add the "admin" user to the group of the /var/log/messages file. On a typical Debian/Ubuntu system, this would mean adding the "admin" user to the "adm" group, since that is the group of the /var/log/messages file.

    To add the admin user to the "adm" group:

     sudo adduser admin adm

    Then, just use ssh without sudo to cat the file.

    Another option is to edit your /etc/sudoers file (using visudo) to allow the admin user to run that command without a sudo password.

    • 2

  3. use Net::OpenSSH.

    On the samples directory from the module distribution you will find some scripts automating sudo interaction.

    • 0